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Reports interfaces that can be annotated with <code>@FunctionalInterface</code>.
<p>Annotating an interface with <code>@FunctionalInterface</code> indicates that the interface
  is functional and no more <code>abstract</code> methods can be added to it.</p>
<p><b>Example:</b></p>
<pre><code>
  interface FileProcessor {
    void execute(File file);
  }
</code></pre>
<p>After the quick-fix is applied:</p>
<pre><code>
  @FunctionalInterface
  interface FileProcessor {
    void execute(File file);
  }
</code></pre>
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